At moment navigating in inventory is headache.
To improove.
You should be able yo move trough rows and slots by just klicking left or right. Not r2 or l2.
There shold be hot keys to move items from one container to another by making active. So there is going to be easier way to move bunch of items at once.
So when you move trough columns the columns wont reset to top of the row but where you left off. That would be a start. Now in wachtowers if you have a box or barrel. You need to scroll trough all the wallas and invisible wall slots to get to the box container. Its bad really bad.
Fix this and the game will be improved a lot!